Method of treating steel alloys which contain chromium and nickel



BENIN?!) ST moths.

USS, 01E BREDENEY, GERMANY.

METHOD 01E TREATING STEEL ALLOYS WHICH CONTAIN CHROMIUM AND NICKEL.

Specification of Letters Patent. Pmtqgntgfl Jam, 31, 11922.,

No Drawing; @riginel application filed June 25, 1913, Serial No. 775,765. Divided and this application filed Jane-19, 1914.

fierial No. 848,169.

(GRANTED UNDER THE PEOVISIGNS 01" THE ACT 0F MARCH 3, 1921;, 41 STAT. L, 1313.

This application is a division of my appli-' cation filed June 25, 1913, Ser al No. 775,765.

This invention 'relates to a method of treating steel alloys, which contain more than 6% chromium, from to nickel and not over 1% carbon and which possess a hardness below 350 Brinell scale in the forged state.

According to this invention said steel from 8% to chromium are either slig tly magnetic or else entirely non-magnetic, are heated to a temperature situated between 1100 and 1200 C. and thereupon (quickly or slowly) u cool.

By means of this heating treatment said alloys will obtain a very great toughness and are made easy to work. The slightly magnetic alloys will become in addition unmagnetic, when quickly cooled.

I claim:

1.. Method of treating steel alloys containing at least 8% chromium, 20% to $72. nickel and not over 1% carbon and having a hardness below 350 (Brinell scale) in the forged state, said method consisting inheating the alloys to a temperature from 1100 to 1200 C. and subsequently cooling them, whereby the alloys obtain great toughness.

2. Method of treating steel alloys contain ing 8% to 25% chromium, 20% to 1}% nickel and not over "1% carbon and having a hardness below 350 (Brinnel scale) in the forged. state, saidmethod consisting in heating the alloys to a temperature from 1100 to 1200 C. and subsequently cooling them quickly, whereby the alloys are made tough and unmagnetic.

In testimony whereof the foregoing speci- -fication is signed in the presence of two witnsses.

- BENNO STRAUSS. [Ls] Witnesses:

ALBERT NUFER,

,FRANOES Nurse. 

